Cyclometallated platinum(II) and platinum(IV) compounds of N-benzylidene-2-chlorobenzylamine. Crystal structure of [PtMe(PPh 3)(C 6H 4CHNCH 2C 6H 4C1-2)

Abstract

The cyclometallated compound [PtMe(SMe 2)(C 6H 4CHNCH 2C 6H 4C1-2)] ( 1) undergoes a displacement reaction with PPh 3 to yield a cyclometallated platinum(II) compound [PtMe(PPh 3)(C 6H 4CHNCH 2C 6H 4C1-2)] ( 2), which has been characterized crystallographically. Complex 2 crystallizes in the monoclinic space group C2/ c, with a = 38.402(4) Å, b = 7.993(3) Å, c = 18.563(3) Å, β = 101.34(3)° and Z = 8. The reaction of 1 with 1,2-bis (diphenylphosphino)ethane (dppe) yields [PtMe(dppe)(C 6H 4CHNCH 2C 6H 4C1-2)]( 3) containing an unidentate C donor imine ligand and a chelating diphosphine. Oxidative addition of methyl iodide to 1 yields a cyclometallated platinum(IV) compound [PtMe 2I(SMe 2)(C 6H 4CHNCH 2C 6H 4C1-2)] ( 4), which undergoes a displacement reaction of SMe 2 by PPh 3 to yield [PtMe 2I(PPh 3)(C 6H 4CHNCH 2C 6H 4C1-2)] ( 5). Compound 5 can also be obtained by oxidative addition of methyl iodide to 2. The stereochemistry of compounds 4 and 5 is discussed.